CN2320426Y

CN2320426Y - Automatic compasses

Info

Publication number: CN2320426Y
Application number: CN 97230766
Authority: CN
Inventors: 钟文清
Original assignee: Individual
Current assignee: Individual
Priority date: 1997-12-30
Filing date: 1997-12-30
Publication date: 1999-05-26
Anticipated expiration: 2007-12-30

Abstract

The utility model relates to a pair of automatic compasses, which belongs to the class of teaching aids. The utility model is characterized in that a miniature motor and a direct current power supply are adopted; a compasses shaft is driven to rotate by a couple of engaged gears to drive a slot type arm with adjustable length to rotate and draw circles; support feet adopt three feet with equal distance and each foot bottom is fixed with a soft cushion with favorable frictional performance; the lower part of a support seat is provided with a circle center needle; a plurality of elastic sheets which can tightly clamp a chalk and a spring which can prop the chalk against the surface of a contact plate all the time are arranged in a fence cylinder sheathed with the chalk. Therefore, the pair of compasses has the advantages of novel structure and strong practicability, and adapts to all kinds of hard blackboards; three-point orientation is stable without slippage and the center of circle is accurate; the size of the radius of a drawn circle can be adjusted, and the use is extremely convenient.

Description

Automatic compasses

The utility model relates to a kind of teaching aid, particularly a kind of Automatic compasses.

The blackboard overwhelming majority of the modern schools of various levels and categories all is that hard material is made.Therefore, original pin type leg compasses can't adapt to existing blackboard.Though occurred the sucked type compasses in the last few years, resembling Chinese patent is exactly an example wherein with notification number CN2076495U disclosed " Combined pointer and compasses for teacher ", but it requires blackboard very flat, and plate face free from admixture, otherwise sucker is ineffective, and especially it aims at relatively difficulty of the center of circle.

The purpose of this utility model design at the deficiencies in the prior art just a kind of can adapt to all kinds of hard blackboards, leg do not rotate, not shoes, radius of a circle length is adjustable, chalk freely the contact plate face, will draw round Automatic compasses by switch.

The purpose of this utility model is realized by following technical proposal: this Automatic compasses comprises handle dish, switch, micro motor, hasp, gear, elastic element, chalk, dc source and gim peg, it have a lower end by bearing fixing in the bearing of band leg, top pass the supporting strap suit chalk fence tube of close-fitting with it and vernier pin the slot type arm the flute profile platform and press fit in the compass shaft of the circular box in the flute profile platform epirelief disk; The compass shaft of circular box inner segment tighten one from regular intervals at the bottom of the box and with the gim peg gear wheel that is meshed of the pinion on the micro motor main shaft of wall within it admittedly, circular box is provided with the box door that connects with gim peg, and door is along being provided with the hasp of being convenient to close; Below bearing, be provided with one with compass shaft concentric and with screw fastening to center of circle pin.

The power of said micro motor is from the dc source that is contained in circular box inwall, drives the meshing gear transmission by switch activated micro motor compass shaft is rotated, and then drive the rotation of slot type arm and the picture circle.

Said slot type arm is to be inserted in by a tongue telescopic arm to constitute in the groove arm, and the length of its arm mixes up the back and fixes with screw according to the radius of a circle adjustable size.

Said suit chalk fence tube is fixed on tongue telescopic arm left end, and its inwall is equipped with several shell fragments of being convenient to clamp chalk, and its internal upper part has one to withstand the chalk spring of contact plate face all the time.

But said vernier pin be with its vernier pin frame be sleeved on the move left and right of locating on the tongue telescopic arm adjacent with chalk fence tube, be used for the five equilibrium line segment.

Said be contained in stretch down in the bearing can regulate its overhanging length to center of circle pin by slack adjuster.

Said leg is three alternate equidistant legs, and each has fixed its sole one and have the good cushion of attriting performance.

Below in conjunction with accompanying drawing the utility model is further described.

Fig. 1 is an overall structure schematic diagram of the present utility model.

Fig. 2 is the utility model dash number 17-slot type arm and dash number 18-flute profile platform package assembly schematic diagram.

With reference to Fig. 1, compass shaft 22 lower ends press fit in the centre bore of bearing 9 by bearing, its top close-fitting a flute profile platform 18, on flute profile platform convex disk interference fit the circular box 19 of its center borehole jack on compass shaft 22, open box door 4, raise lid 21, a gear wheel 6 is pressed on the compass shaft 22 and is meshed with pinion 6 on micro motor 3 main shafts that are fixed on gim peg 24 in the box again with at regular intervals at the bottom of the box.In box, be fixed with simultaneously dc source 20, connect power supply and motor, press lid 21, shut box door 4,, screw in handle dish 1 again in compass shaft 22 upper ends because the effect of box door edge hasp makes door be difficult for opening by the switch 2 usefulness electric wires that are located on the lid.Bearing 9 has three alternate equidistant legs 10, has fixed a cushion 28 that attriting performance is good at each leg sole, fix on the blackboard with it does not rotate, non-slip.An aperture concentric with compass shaft 22 is arranged in bearing 9 bottoms, and one is inserted in its holes center of circle pin 11, is fixed with screw 25.Adjustable to the overhanging length of center of circle pin, it only contacts blackboard and does not insert blackboard, and this just can guarantee accurate to the center of circle.With reference to Fig. 2, the last plane of bearing 9 is smooth smooth, and the lower plane of flute profile platform 18 is same smooth smooth.When therefore compass shaft 22 drives the rotation of flute profile platform, need only the effect by lubricating oil, two planes are not have frictional resistance.Groove arm 7 is to be set in the groove on flute profile platform 18 both sides, and in tongue telescopic arm 13 to be covers pack into the groove arm 7, and can horizontally slip, what promptly the length of its arm can be by the size adjustment of picture radius of circle, after adjusting, fixing with screw 26.Fixed a suit chalk fence tube 27 at tongue telescopic arm 13 left ends, wall is provided with several in order to clamp the shell fragment 15 of chalk 14 within it, top within it is provided with a spring 8, withstand chalk with it and remain the contact blackboard, relative fixed has a vernier pin 12 with vernier pin frame 16 location on the tongue telescopic arm 13 adjacent with suit chalk fence tube 27, it adjusts the distance of determining itself and chalk point about on the convex telescopic arm with vernier pin frame, thereby plays the function of five equilibrium line segment.

During use, on blackboard, select the center of circle earlier and, mix up slot type arm 17 radiuses again with chalk point note, lever dish 1 is held leg 10 on the other hand on the other hand, and is visual to center of circle pin 11, make center of circle pin 11 is aimed at the center of circle of some note on the plate face, leg 10 is withstood on the blackboard, pin handle dish 1, Push switch 2, start micro motor 3, drive compass shaft 22 by meshing gear 6 and rotate, and then drive

flute profile platform

18 and 17 rotations of slot type arm, promptly finish the picture circle.Then cut off the electricity supply by switch 2 again.

In sum, the utlity model has following advantage:

The one, novel structure adopts micromachine and meshing gear transmission, drives to be tight with on the compass shaft Slot type arm rotation and from the animation circle;

The 2nd, because the slot type arm is made of groove arm and tongue telescopic arm, therefore make the length of arm adjustable, Also be that the radius of a circle size is adjustable, make it wide accommodation;

The 3rd, adopting three legs and having fixed under foot a cushion with attriting performance is three-point fix, Make its steady positioning, do not rotate, non-slip, can adapt to all kinds of blackboards, it is accurate to the center of circle for dragon;

The 4th, in suit chalk fence tube, shell fragment and spring are set, chalk is remained freely The contact plate face;

The 5th, because the vernier pin is set, therefore, make the utility model increase the straight of circumference in equal parts, circle The function of footpath and five equilibrium line segment.

Claims

1, a kind of Automatic compasses, comprise handle dish (1), switch (2), micro motor (3), hasp (5), gear (6), flexible member (8,15), chalk (14), dc source (20) and gim peg (24), it is characterized in that having its lower end by bearing fixing in the bearing (9) of band leg (10), the compass shaft (22) of the interior circular box (19) of the flute profile platform (18) of slot type wall (17) of the supporting strap suit chalk fence tube (27) of close-fitting with it and vernier pin (12) and interference fit flute profile platform (18) epirelief disk is passed on its top; Tighten one from regular intervals at the bottom of the box and at the compass shaft (22) of circular box (19) inner segment with (24 are packed in the gear wheel (6) that the pinion (6) on micro motor (3) main shaft of its inwall is meshed with gim peg, circular box (19) is provided with the box door (4) that connects with gim peg (24), door is along being provided with the hasp of being convenient to close (5), and lid (21) can start and cover; Below bearing (9), be provided with one with compass shaft (22) concentric and with screw (25) fastening to center of circle pin (11).

2, according to the described Automatic compasses of claim 1, the power that it is characterized in that said micro motor (3) is from the dc source (20) that is contained in circular box (19) inwall, start the transmission of micro motor (3) drive meshing gear (6) by switch (2) and make compass shaft (22) rotation, and then drive slot type arm (7) rotation and draw round.

3, according to the described Automatic compasses of claim 1, it is characterized in that said slot type arm (17) is to be inserted in the groove arm (7) by a tongue telescopic arm (13) to constitute, the length of its arm is according to drawing the radius of a circle adjustable size, and it is fixing with screw (26) to mix up the back.

4, according to the described Automatic compasses of claim 1, it is characterized in that said suit chalk fence tube (27) is fixed on tongue telescopic arm (13) left end, its inwall is equipped with several shell fragments (15) of being convenient to clamp chalk (14), and its internal upper part has one to withstand chalk (14) spring of contact plate face (8) all the time.

5, according to the described Automatic compasses of claim 1, it is characterized in that said vernier pin (12) be with its vernier pin frame (16) be sleeved on the tongue telescopic arm (13) adjacent with chalk fence tube (27) but go up the location move left and right, be used for the five equilibrium line segment.

6, according to the described Automatic compasses of claim 1, it is characterized in that said be contained in stretch down in the bearing (9) can regulate its overhanging length to center of circle pin (11) by slack adjuster (25).

7, according to the described Automatic compasses of claim 1, it is characterized in that said leg (10) is three alternate equidistant legs, each has fixed a cushion (28) with attriting performance its sole.